function vNotNull(e) {
    if(e == '' || e == null) {
        return "n";
    } else {
        return "y";
    }
}
function vNum(e) {
    if(isNaN(e)) {
        return "n";
    } else {
        return "y";
    }
}
function vEmail(e) {
    var email = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/;
    if(!email.test(e)) {
        return "n";
    } else {
        return "y";
    }
}